Dust collector



A ril 2, W J. F. REIIF DUST COLLECTOR Filed Oct. 17, 1932 till ill

otente rosette illllltlill l filflililit .llohu 2 il icit, it'hlcago, lllli Applicutiou filllctolrer lll, litliit, Serlul ltthllhl Ji ly invention relates to dust collectors or 'tra s and particularly to that type of collector wherein. the oir from which the dust is heme collected is coursed to rotate so as to force the heavy dust particles to the outside of the dust chair ricer.

r, it is the principei purpose of my ihventioutc pro-ride a novel means of remorine co do rehle portion of that, dust which u out directly hy the centrifugal motioli in rotetiou oi the sir inthe dust church-er.

ltfore speciilce it is h, purpose of my :lh dustcollector the iced u dust eotewely .tl the airvent from the collection cl er to concentrate ar d remote e, llll M, which would horroally' find its tip-the cut.

veht which includes guiding; meuiher irrterposed hetween' the inlet to the dust Gllhlllllfil arid the .air "vent which guiding rneiriher else furro tiohs to force the incoming duet laden eir dowu= wardly end outwardly.

will descrihe the preferred form r r reution hy reference to the eccouipahrl U drow hie? wherein-- l'" i is a vertical. section through it dust col lector of the pressure type; v

ll a similar section through at col lector oi the type wherein a suction veht as contrasted with the pressure type shown in Tie; l. where air is forced lute the collector under a pressure;

l ig. is e. top plan View of the term shown in li ig. 2; and r is a section substantially on the line of li le.

I Referring now in detail to the drowinu, will descrihe my invention as applied totwo conventional types of centrifugal dust collectors.

The first type, as shown in Fig. i, has the dust laden uir blown into the dust chamber h through the tangential inletlt in a well known fashion.

U The air coming into the chamber 5 naturally l is cro pioyed the line leading" from the tuhular uir lei. lilli 'ltl dust falls from the outlet 9 into a storage room where it remains until disposed of. I

Elwine to the whirlihe motion of the air within the dust charnher ii, the tubular air vent ill the outlet term iiues through which there is a it tendency for the eh irom the outside to enter the dust charuher alone the center of the oir teht the outlet ll employ the usuelhaiile at it which will, properly positioned and of the proper size, prevent this difiiculty so for as the count upward from theoutlet it is concerned. I All of the poi-he; features areusuallr practiced in dust collecting. ".i have, h0wever, provided, the use of the ruemher i in conjunction witl. e air rent it and the portion lit ill which is c ty a part of the monitor l, a new feature t ch vital importance in dust collecting. uiachhies of the centrifugal type will tulre out, constructed, the greater portion oi the do n the air passed through their vary up to ten or flit hl'lill, heihg t it; also the most difficult to handle cteway provided hr i of the two conical sec mir vent is really a dual the air coming in through the le .l eds suriace of the guide lliell'l" interposed puth so to came the oir to out hour the outer wall of the dust collector, end the outwz-irdli flaring: lower por tiou ll the euide rueuiher causes the air end the dust therein. to move gradually outward and downward in the dust chamber. This a hotter whlrliriu motion to the air and, in this fashion, facilitates the removal of the dust at the heeinning oi the operation. The air, however, must escape so it moves upwardly'after having below the lower edge of l, and, us the air is still whirling with very little air at the center, the air and line dust carried upward with it ride along the inner surface of the member i being gradually narrowed in the circumference of its whirling.

The efiect of this action is to concentrate the dust in the air along the edge of the member l, and, when the lower edge of the member ill is reached, this concentrated dust and air passes upwardly into the expanding chamber it while the remoinder of the air nearer the center continues to whirl upward through the air vent ill and may escape to atmosphere or some other place through the outlet pipe II. The concentrated air and dust in the expanding chamber I3 is removed through the outlets such'as l5 and I6; and, if desired, it may be returned to the fan driving the dust into the inlet 6 so as to again pass through the machine.

In the suction type of collector shown in Fig. 2, the structure of the dust chamber 5, conical portion 8, air vent l0, guide members 1 and I2 forming the dust gateway, outlets I5 and I6 are substantially the same as in Fig. 1. In this type of machine, however, dust is usually collected from a number of sources so I have shown the tangential inlets 6' as located one on each side in contrast to the one inlet 6 of Fig. 1. A plurality of supply pipes or feeders such as ll, l8, and I9 may lead into these tangential air inlets. The outlets l5 and I6 are also connected by the pipes 20 and 2| back to the inlets 6 so as to return the concentrated dust and air removed by means of the gateway to'the dust chamber again.

' The suction type of machine operating with a pressure within the chamber 5 of less than atmosphere must naturally be closed at the bottom in order to prevent air from rushing upwardly and causing a break-up of the whirling motion within the chamber which would result in a substantial loss of the dust collected. To be sure that the chamber 5 is always closed, I provide a pair of traps or cut-offs 22 and 23 at the bottom of the portion 8 of the dust chamber.

Since the lower conical portion 3 in this device is essentially a settling chamber where dust collects and is then discharged through the outlets, it is essential that as little air circulation as possible shall take place in this lower-part. For this reason, I use the wide baiiie or separator dome 25-, and the same may be suspended, as shown, from the member a or otherwise supported, this dome serving to provide a narrow passageway at 25 through which the dust will settle down into the chamber formed by the conical portion 8. The vent at permits what little air is carried down by the dust to return to the upper portion of the dust chamber without creating a disturbance in the lower or settling part.

The function and operation of the members "i and ii. is in general substantially the same as in Fig. 1. That is, the dust laden air enters through any of the pipes it or l8 or i9, is caused to circulate or whirl around within the dust-chamber, and is directed downwardly and outwardly by the outer surface of the member The inner surface of the member 5 then functions as before described to concentrate .the fine dust as the air whirls upwardly toward the air vent and to remove this dust into the chamber substantially in. the same fashion as in In some cases where the dust is of a sticky or clogging type, it is possible to encounter difiiculty in getting out the dust passing through the gateway between the vent l0 and the guide member made up of the portions 1 and I2. I preferably mount the vent l0 so it can be adjusted up and down. This is done in Fig. 1 by means of openings 21 and bolts 28.

Extending the vent more or less below the smallest diameter of the guide member increases or decreases the amount of air and dust taken off by the gateway.

The above description, it is believed, will enable those skilled in this art to fully understand the present invention and the advantages thereof. It is also believed to be obvious that various modifications may be made from the exact details of the structure shown and described without departing from the scope of the invention.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. A dust collector comprising a casing having a cylindrical upper portion provided with a tangential inlet near the top thereof and provided with a closed top having a central opening, a tubular vent member extending down into said casing from said opening, a second tubular member extending from the top of the casing down around said vent member and below the lower end of said vent member, said second tu bular member increasing in diameter upwardly and, downwardly from a point adjacent the lower end of the vent member, said casing having an outlet opening through the top thereof between the junction of the vent member with the top and the junction of the second tubular member with the top.

2. A dust collector comprising a casing hay" ing a cylindrical upper portion provided with a tangential inlet near the top thereof and pro-- vided with a closed top having a central open ing, a tubular vent member extending down into said casing from said opening, a second tubular member extending from the top of the casing down around said vent member and below the lower end of said vent member, said second tubular member increasing in diameter upwardly and downwardly from a point adjacent the lower end of the vent member, means to return the i terial from the space between said tubular members directly to said inlet, said, casing having a conical lower dust collecting portion, and a barrier separating the cylindrical and conical portions of the casing, said barrier sloping downwardly from the center to the rim and being slightly spaced from the casing at the rim, said barrier having a vent at the center thereof.

JOHN F. 

